plugeth/ethchain/block_chain.go

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package ethchain
import (
"bytes"
"github.com/ethereum/eth-go/ethutil"
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"github.com/ethereum/eth-go/ethwire"
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"log"
"math"
"math/big"
)
type BlockChain struct {
Ethereum EthManager
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// The famous, the fabulous Mister GENESIIIIIIS (block)
genesisBlock *Block
// Last known total difficulty
TD *big.Int
LastBlockNumber uint64
CurrentBlock *Block
LastBlockHash []byte
}
func NewBlockChain(ethereum EthManager) *BlockChain {
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bc := &BlockChain{}
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bc.genesisBlock = NewBlockFromBytes(ethutil.Encode(Genesis))
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bc.Ethereum = ethereum
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bc.setLastBlock()
return bc
}
func (bc *BlockChain) Genesis() *Block {
return bc.genesisBlock
}
func (bc *BlockChain) NewBlock(coinbase []byte, txs []*Transaction) *Block {
var root interface{}
var lastBlockTime int64
hash := ZeroHash256
if bc.CurrentBlock != nil {
root = bc.CurrentBlock.state.trie.Root
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hash = bc.LastBlockHash
lastBlockTime = bc.CurrentBlock.Time
}
block := CreateBlock(
root,
hash,
coinbase,
ethutil.BigPow(2, 32),
nil,
"",
txs)
if bc.CurrentBlock != nil {
var mul *big.Int
if block.Time < lastBlockTime+42 {
mul = big.NewInt(1)
} else {
mul = big.NewInt(-1)
}
diff := new(big.Int)
diff.Add(diff, bc.CurrentBlock.Difficulty)
diff.Div(diff, big.NewInt(1024))
diff.Mul(diff, mul)
diff.Add(diff, bc.CurrentBlock.Difficulty)
block.Difficulty = diff
}
return block
}
func (bc *BlockChain) HasBlock(hash []byte) bool {
data, _ := ethutil.Config.Db.Get(hash)
return len(data) != 0
}
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// TODO: At one point we might want to save a block by prevHash in the db to optimise this...
func (bc *BlockChain) HasBlockWithPrevHash(hash []byte) bool {
block := bc.CurrentBlock
for ; block != nil; block = bc.GetBlock(block.PrevHash) {
if bytes.Compare(hash, block.PrevHash) == 0 {
return true
}
}
return false
}
func (bc *BlockChain) CalculateBlockTD(block *Block) *big.Int {
blockDiff := new(big.Int)
for _, uncle := range block.Uncles {
blockDiff = blockDiff.Add(blockDiff, uncle.Difficulty)
}
blockDiff = blockDiff.Add(blockDiff, block.Difficulty)
return blockDiff
}
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func (bc *BlockChain) FindCanonicalChainFromMsg(msg *ethwire.Msg, commonBlockHash []byte) bool {
var blocks []*Block
for i := 0; i < (msg.Data.Len() - 1); i++ {
block := NewBlockFromRlpValue(msg.Data.Get(i))
blocks = append(blocks, block)
}
return bc.FindCanonicalChain(blocks, commonBlockHash)
}
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// Is tasked by finding the CanonicalChain and resetting the chain if we are not the Conical one
// Return true if we are the using the canonical chain false if not
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func (bc *BlockChain) FindCanonicalChain(blocks []*Block, commonBlockHash []byte) bool {
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// 1. Calculate TD of the current chain
// 2. Calculate TD of the new chain
// Reset state to the correct one
chainDifficulty := new(big.Int)
// Calculate the entire chain until the block we both have
// Start with the newest block we got, all the way back to the common block we both know
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for _, block := range blocks {
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if bytes.Compare(block.Hash(), commonBlockHash) == 0 {
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log.Println("[CHAIN] We have found the common parent block, breaking")
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break
}
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log.Println("Checking incoming blocks:")
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chainDifficulty.Add(chainDifficulty, bc.CalculateBlockTD(block))
}
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log.Println("[CHAIN] Incoming chain difficulty:", chainDifficulty)
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curChainDifficulty := new(big.Int)
block := bc.CurrentBlock
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for i := 0; block != nil; block = bc.GetBlock(block.PrevHash) {
i++
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if bytes.Compare(block.Hash(), commonBlockHash) == 0 {
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log.Println("[CHAIN] We have found the common parent block, breaking")
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break
}
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anOtherBlock := bc.GetBlock(block.PrevHash)
if anOtherBlock == nil {
// We do not want to count the genesis block for difficulty since that's not being sent
log.Println("[CHAIN] At genesis block, breaking")
break
}
log.Printf("CHECKING OUR OWN BLOCKS: %x", block.Hash())
log.Printf("%x", bc.GenesisBlock().Hash())
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curChainDifficulty.Add(curChainDifficulty, bc.CalculateBlockTD(block))
}
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log.Println("[CHAIN] Current chain difficulty:", curChainDifficulty)
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if chainDifficulty.Cmp(curChainDifficulty) == 1 {
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log.Printf("[CHAIN] The incoming Chain beat our asses, resetting to block: %x", commonBlockHash)
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bc.ResetTillBlockHash(commonBlockHash)
return false
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} else {
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log.Println("[CHAIN] Our chain showed the incoming chain who is boss. Ignoring.")
return true
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}
}
func (bc *BlockChain) ResetTillBlockHash(hash []byte) error {
lastBlock := bc.CurrentBlock
returnTo := bc.GetBlock(hash)
// TODO: REFACTOR TO FUNCTION, Used multiple times
bc.CurrentBlock = returnTo
bc.LastBlockHash = returnTo.Hash()
info := bc.BlockInfo(returnTo)
bc.LastBlockNumber = info.Number
// END TODO
bc.Ethereum.StateManager().PrepareDefault(returnTo)
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err := ethutil.Config.Db.Delete(lastBlock.Hash())
if err != nil {
return err
}
var block *Block
for ; block != nil; block = bc.GetBlock(block.PrevHash) {
if bytes.Compare(block.Hash(), hash) == 0 {
log.Println("[CHAIN] We have arrived at the the common parent block, breaking")
break
}
err = ethutil.Config.Db.Delete(block.Hash())
if err != nil {
return err
}
}
log.Println("[CHAIN] Split chain deleted and reverted to common parent block.")
return nil
}
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func (bc *BlockChain) GenesisBlock() *Block {
return bc.genesisBlock
}
// Get chain return blocks from hash up to max in RLP format
func (bc *BlockChain) GetChainFromHash(hash []byte, max uint64) []interface{} {
var chain []interface{}
// Get the current hash to start with
currentHash := bc.CurrentBlock.Hash()
// Get the last number on the block chain
lastNumber := bc.BlockInfo(bc.CurrentBlock).Number
// Get the parents number
parentNumber := bc.BlockInfoByHash(hash).Number
// Get the min amount. We might not have max amount of blocks
count := uint64(math.Min(float64(lastNumber-parentNumber), float64(max)))
startNumber := parentNumber + count
num := lastNumber
for ; num > startNumber; currentHash = bc.GetBlock(currentHash).PrevHash {
num--
}
for i := uint64(0); bytes.Compare(currentHash, hash) != 0 && num >= parentNumber && i < count; i++ {
// Get the block of the chain
block := bc.GetBlock(currentHash)
currentHash = block.PrevHash
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chain = append(chain, block.Value().Val)
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num--
}
return chain
}
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func (bc *BlockChain) GetChain(hash []byte, amount int) []*Block {
genHash := bc.genesisBlock.Hash()
block := bc.GetBlock(hash)
var blocks []*Block
for i := 0; i < amount && block != nil; block = bc.GetBlock(block.PrevHash) {
blocks = append([]*Block{block}, blocks...)
if bytes.Compare(genHash, block.Hash()) == 0 {
break
}
i++
}
return blocks
}
func AddTestNetFunds(block *Block) {
for _, addr := range []string{
"8a40bfaa73256b60764c1bf40675a99083efb075", // Gavin
"e6716f9544a56c530d868e4bfbacb172315bdead", // Jeffrey
"1e12515ce3e0f817a4ddef9ca55788a1d66bd2df", // Vit
"1a26338f0d905e295fccb71fa9ea849ffa12aaf4", // Alex
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"2ef47100e0787b915105fd5e3f4ff6752079d5cb", // Maran
} {
//log.Println("2^200 Wei to", addr)
codedAddr := ethutil.FromHex(addr)
addr := block.state.GetAccount(codedAddr)
addr.Amount = ethutil.BigPow(2, 200)
block.state.UpdateAccount(codedAddr, addr)
}
}
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func (bc *BlockChain) setLastBlock() {
data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
if len(data) != 0 {
block := NewBlockFromBytes(data)
info := bc.BlockInfo(block)
bc.CurrentBlock = block
bc.LastBlockHash = block.Hash()
bc.LastBlockNumber = info.Number
log.Printf("[CHAIN] Last known block height #%d\n", bc.LastBlockNumber)
} else {
AddTestNetFunds(bc.genesisBlock)
bc.genesisBlock.state.trie.Sync()
// Prepare the genesis block
bc.Add(bc.genesisBlock)
//log.Printf("root %x\n", bm.bc.genesisBlock.State().Root)
//bm.bc.genesisBlock.PrintHash()
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}
// Set the last know difficulty (might be 0x0 as initial value, Genesis)
bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
log.Printf("Last block: %x\n", bc.CurrentBlock.Hash())
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}
func (bc *BlockChain) SetTotalDifficulty(td *big.Int) {
ethutil.Config.Db.Put([]byte("LastKnownTotalDifficulty"), td.Bytes())
bc.TD = td
}
// Add a block to the chain and record addition information
func (bc *BlockChain) Add(block *Block) {
bc.writeBlockInfo(block)
// Prepare the genesis block
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bc.CurrentBlock = block
bc.LastBlockHash = block.Hash()
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encodedBlock := block.RlpEncode()
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log.Println(encodedBlock)
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ethutil.Config.Db.Put(block.Hash(), encodedBlock)
ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
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}
func (bc *BlockChain) GetBlock(hash []byte) *Block {
data, _ := ethutil.Config.Db.Get(hash)
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if len(data) == 0 {
return nil
}
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return NewBlockFromBytes(data)
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}
func (bc *BlockChain) BlockInfoByHash(hash []byte) BlockInfo {
bi := BlockInfo{}
data, _ := ethutil.Config.Db.Get(append(hash, []byte("Info")...))
bi.RlpDecode(data)
return bi
}
func (bc *BlockChain) BlockInfo(block *Block) BlockInfo {
bi := BlockInfo{}
data, _ := ethutil.Config.Db.Get(append(block.Hash(), []byte("Info")...))
bi.RlpDecode(data)
return bi
}
// Unexported method for writing extra non-essential block info to the db
func (bc *BlockChain) writeBlockInfo(block *Block) {
bc.LastBlockNumber++
bi := BlockInfo{Number: bc.LastBlockNumber, Hash: block.Hash(), Parent: block.PrevHash}
// For now we use the block hash with the words "info" appended as key
ethutil.Config.Db.Put(append(block.Hash(), []byte("Info")...), bi.RlpEncode())
}
func (bc *BlockChain) Stop() {
if bc.CurrentBlock != nil {
log.Println("[CHAIN] Stopped")
}
}